V-AFC sputtering
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Originally posted by sireousrex
Did your tuner make adjustments while the car was on the dyno? Or was he just guesstemating
Did your tuner make adjustments while the car was on the dyno? Or was he just guesstemating
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Joined: May 2001
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From: Goodyear, AZ
Originally posted by sireousrex
Exactly why I ask. I have heard on more than a few occasions about people paying good money to a "tuner" who just does seat of pants adjustments.
Exactly why I ask. I have heard on more than a few occasions about people paying good money to a "tuner" who just does seat of pants adjustments.
Joined: Oct 2000
Posts: 14,269
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From: Redmond, WA
Your problem comes from the fact that the ignition timing map is in a mis-match w/ your cams (VTEC on vs off).
To get a visual of this set the display to show you VTi and VTo. Now drive and get the car in the Dead Zone (where it sputters) and note the VTo = ON but the VTi = OFF. In this state the ECU thinks you're on the low cams and is using the appropriate ignition timing map for the low cam, problem is, the V-AFC has you on the Hi cam lobs!
There is a function to half a$$ address this issue called the V/T Unmt (VTEC Unmatch Fuel Correction, pg 33) but it's only half a Band-Aid at best, don
To get a visual of this set the display to show you VTi and VTo. Now drive and get the car in the Dead Zone (where it sputters) and note the VTo = ON but the VTi = OFF. In this state the ECU thinks you're on the low cams and is using the appropriate ignition timing map for the low cam, problem is, the V-AFC has you on the Hi cam lobs!
There is a function to half a$$ address this issue called the V/T Unmt (VTEC Unmatch Fuel Correction, pg 33) but it's only half a Band-Aid at best, don
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